输入两个数，可以进行加减乘除的操作。
完整代码如下所示：
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>加减乘除的简单运算</title><style>#operation {margin: 10px;}#box {width: 200px;height: 100px;text-align: center;font-size: 30px;border-radius: 10px;background-color: pink;}</style>
</head><body><h1>请输入两个参加运算的整数</h1><div style="margin-bottom: 10px;"><label for="oper1">操作数1:</label><input type="text" name="oper1" id="oper1" placeholder="请输入第一个操作数"></div><div><label for="oper2">操作数2:</label><input type="text" nama="oper2" id="oper2" placeholder="请输入第二个操作数"></div><div id="operation"><button onclick="operationFn('+')">加法</button><button onclick="operationFn('-')">减法</button><button onclick="operationFn('*')">乘法</button><button onclick="operationFn('/')">除法</button></div><div id="box"></div>
</body>
<script>var oper1 = document.getElementById("oper1")var oper2 = document.getElementById("oper2")var box = document.getElementById("box")function operationFn(type) {var x = parseInt(oper1.value);var y = parseInt(oper2.value);if (type === "+") {sum = x + y;} else if (type === "-") {sum = x - y;} else if (type === "*") {sum = x * y;} else if (type === "/") {sum = x / y;}box.innerHTML = sum;}</script></html>
